首页> 外文期刊>Conservation Genetics >Demographic bottlenecks and low gene flow in remnant populations of the critically endangered Berchemiella wilsonii var. pubipetiolata (Rhamnaceae) inferred from microsatellite markers
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Demographic bottlenecks and low gene flow in remnant populations of the critically endangered Berchemiella wilsonii var. pubipetiolata (Rhamnaceae) inferred from microsatellite markers

机译:极度濒危的白僵菌的剩余种群中的人口瓶颈和低基因流量。从微卫星标记推断出的鼠李(鼠李科)

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摘要

Berchemiella wilsonii var. pubipetiolata (Rhamnaceae) is an endangered plant with only four remnant populations in eastern China. Population genetic information is essential for understanding population history and formulating conservation strategies for this species. Thirteen microsatellite loci were used to investigate genetic variation and population structure of the four remnant populations. Moderate levels of expected heterozygosity (H E = 0.466–0.543) and low allelic diversity (A = 3.1–3.6 and A R = 2.2–2.4, respectively) were observed within populations. Bottleneck tests found three out of four populations to deviate from mutation-drift equilibrium under the two-phase model (TPM), suggesting a recent population decline, which is congruent with known demographic history. The evolutionary history of the species seems dominated by genetic drift rather than gene flow. Low historical gene flow was inferred from several different approaches and N m ranged from 0.582 by the private allele method to 0.783 by the coalescent method. Contemporary gene flow was also found to be even lower for only one first generation migrant was detected with individual-based assignment analysis. Restricted pollen and seed dispersal as well as a recent decline in population size associated with habitat fragmentation may have contributed to low levels of historical and contemporary gene flow, and resulted in a high genetic differentiation. Under this scenario, Berchemiella wilsonii var. pubipetiolata populations are expected to display more pronounced population genetic structure in the future as a result of increased inbreeding and genetic drift.
机译:百日草pubipetiolata(鼠李科)是一种濒危植物,在中国东部仅有四个残留种群。种群遗传信息对于了解种群历史和制定该物种的保护策略至关重要。使用13个微卫星基因座来研究这四个残余种群的遗传变异和种群结构。在人群中观察到中等水平的期望杂合度(H E = 0.466–0.543)和低等位基因多样性(分别为A = 3.1–3.6和A R = 2.2–2.4)。瓶颈测试发现,在两阶段模型(TPM)下,四分之三的人口偏离了突变漂移均衡,这表明最近的人口下降了,这与已知的人口历史一致。该物种的进化历史似乎主要由遗传漂移而不是基因流决定。从几种不同的方法推断出较低的历史基因流,N m范围从私有等位基因方法的0.582到合并方法的0.783。通过基于个体的分配分析,发现只有一名第一代移民,当代基因流量甚至更低。花粉和种子传播受限制,以及最近与生境破碎​​化相关的种群数量下降,可能导致历史和当代基因流水平低下,并导致高度的基因分化。在这种情况下,野生白屈菜。由于近亲繁殖和遗传漂移的增加,预计将来pubipetiolata种群将显示出更明显的种群遗传结构。

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